Multi-Wave and Hybrid Imaging Techniques: A New Direction for Nondestructive Testing and Structural Health Monitoring

Cheng, Yuhua; Deng, Yiming; Cao, Jing; Xiong, Xin; Bai, Libing; Li, Zhaojun

doi:10.3390/s131216146

Cited by 19 publications

(13 citation statements)

References 117 publications

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“…Perturbations in magnetic field can be analyzed by measuring the rotation of light polarization. As a result, the MO images can be acquired with pixel intensity correlating with the strength of the normal magnetic fields [20]. In 2006, an MOI technology, called LMOI (linear MO imaging), was patented in Europe by Joubert and Pinassaud as shown in Fig.…”

Section: Physics and Classification Of Moi Systemsmentioning

confidence: 99%

Principles of Magneto-optic Imaging and Its Applications

Deng

Cheng²,

Xuan

et al. 2015

Integrated Imaging and Vision Techniques for Industrial Inspection

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Magneto-optic imaging (MOI) is an emerging hybrid imaging technique that innovatively generates two-dimensional images by combining electromagnetic and optical energies. It has been widely used in detecting surface and subsurface cracks and corrosion in aircraft skins for nondestructive testing purpose. The merits of the MOI that make it attractive include rapid and large-area inspection, insensitivity to liftoff variation, and easy interpretation in contrast to the complex impedance data of conventional eddy current inspections. The early instrument provides binary images of the anomalies based on eddy current induction techniques and an MO sensor using the Faraday's rotation effect. This chapter will give a comprehensive review on this relatively new sensing technology and discuss the recent advances on MOI including the development of novel optical sources and magnetic film materials for various applications, the integration of MOI sensors with automated systems, and the state-of-the-art post-processing algorithms.

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Section: Physics and Classification Of Moi Systemsmentioning

confidence: 99%

Principles of Magneto-optic Imaging and Its Applications

Deng

Cheng²,

Xuan

et al. 2015

Integrated Imaging and Vision Techniques for Industrial Inspection

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“…Passive, steady state or static thermography; this technique operates in two wavelength ranges, 3-5 μm (SWIR) and 8-12 μm (LWIR) [6].Where IR radiationenergy depends on the chosen wavelength range. Passive thermography isessentially based on analysis where no external excitation is used to excitethermal gradients on the test specimen's surface [11].…”

Section: Various Evaluation Techniques In Thermographymentioning

confidence: 99%

A Heuristic Non Destructive Evaluation Technique For Rebar Corrosion of Marine Structures based on the synergy of Infrared Thermography, Signal and Image Processing

Kannan¹,

Manoharan²,

Venkataraman³

2015

Proceedings of the 2015 Asia International Conference on Quantitative InfraRed Thermography

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The marine structures predominantly make Rebar as the reinforcement steel as tension device mainly to strengthen and hold concrete intact. As these structures are in constant contact with sea water, they develop corrosion due to salinity of water. There are emerging challenges in exact quantification of these parameters. The present paper aims to dwell on corrosion mechanisms including rebar corrosion and reviews the various evaluation techniques on thermography by elaborating the methods.A simplistic heuristic infrared thermography method is described for collecting images of the specimens and applying digital signal & image processing techniques on them. Iterative data capturing is done for effective synergy of thermography and signal & image processing techniques.

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“…Non-Destructive Testing (NDT) techniques are widely used for embedded crack detection inside solid materials, with effective results in the quality control and material inspection strategies in modern industry [1]. Ultrasound transducers are considered the most common devices for NDT inspection thanks to their wide frequency band selection, small sizes and ability to work in harsh environments [2,3]. The ultrasound transducers can be used in two major modes of exciter/ receiver operation, namely pulse-echo or pitch-catch modes [4,5].…”

Section: Introductionmentioning

confidence: 99%

Fully Non-Contact Hybrid NDT Inspection for 3D Defect Reconstruction Using an Improved SAFT Algorithm

Selim¹,

Trull²,

Delgado-Prieto³

et al. 2019

Preprint

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Non-destructive testing of metallic objects that may contain embedded defects of different sizes is an important application in many industrial branches for quality control. Most of these techniques allow defect detection and its approximate localization, but very few give enough information for its 3D reconstruction. Here we present a hybrid laser – transducer system that combines remote laser-generated ultrasound excitation and non-contact ultrasonic transducer detection. This fully non-contact method gives access to separating scan areas on different object’s faces and defect details from different angles/perspectives can be analysed. This hybrid system can analyse the whole object’s volume data and allow a 3D reconstruction image of the embedded defects. As a novelty for the signal processing improvement, we use a 2D apodization window filtering technique, applied along with the synthetic aperture focusing algorithm in order to remove the undesired effects of side lobes and wide-angle reflections of propagating ultrasound waves, thus, enhancing the resulting 3D image of the defect. We provide both qualitative and quantitative volumetric results with high accuracy and resolution compared with conventional techniques.

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Multi-Wave and Hybrid Imaging Techniques: A New Direction for Nondestructive Testing and Structural Health Monitoring

Cited by 19 publications

References 117 publications

Principles of Magneto-optic Imaging and Its Applications

Principles of Magneto-optic Imaging and Its Applications

A Heuristic Non Destructive Evaluation Technique For Rebar Corrosion of Marine Structures based on the synergy of Infrared Thermography, Signal and Image Processing

Fully Non-Contact Hybrid NDT Inspection for 3D Defect Reconstruction Using an Improved SAFT Algorithm

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